Skip to main content
OSTI.GOVU.S. Department of Energy Office of Scientific and Technical Information
U.S. Department of Energy
Office of Scientific and Technical Information
 

Conducting interfaces between amorphous layers and SrTiO3(110) and SrTiO3(111)

Journal Article · · Solid State Ionics
 [1];  [2];  [3];  [3];  [3];  [3]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. Complutense de Madrid, Madrid (Spain)
  2. Institut de Ciencia de Materials de Barcelona (ICMAB-CSIC), Bellaterra (Spain); Univ. Autonoma de Barcelona, Bellaterra (Spain)
  3. Institut de Ciencia de Materials de Barcelona (ICMAB-CSIC), Bellaterra (Spain)
+ Show Author Affiliations
Interfaces between (110) and (111)SrTiO3 (STO) single crystalline substrates and amorphous oxide layers, LaAlO3 (a-LAO), Y:ZrO2 (a-YSZ), and SrTiO3 (a-STO) become conducting above a critical thickness tc. Here we show that tc for a-LAO does not depend on the substrate orientation, i.e. tc (a-LAO/(110)STO) ≈ tc(a-LAO/(111)STO) interfaces, whereas it strongly depends on the composition of the amorphous oxide: tc(a-LAO/(110)STO) < tc(a-YSZ/(110)STO) < tc(a-STO/(110)STO). It is concluded that the formation of oxygen vacancies in amorphous-type interfaces is mainly determined by the oxygen affinity of the deposited metal ions, rather than orientation-dependent enthalpy vacancy formation and diffusion. Furthermore, scanning transmission microscopy characterization of amorphous and crystalline LAO/STO(110) interfaces shows much higher amount of oxygen vacancies in the former, providing experimental evidence of the distinct mechanism of conduction in these interfaces.
Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
DOE Contract Number:
AC05-00OR22725
OSTI ID:
1265973
Journal Information:
Solid State Ionics, Journal Name: Solid State Ionics Vol. 281; ISSN 0167-2738
Publisher:
Elsevier
Country of Publication:
United States
Language:
English

Similar Records

First-principles modeling of conductivity at the (001), (110), and (111) SrTiO3/LaAlO3 heterointerfaces
Journal Article · Wed Oct 13 20:00:00 EDT 2021 · Physical Review. B · OSTI ID:2532382
Dominant role of oxygen vacancies in electrical properties of unannealed LaAlO{sub 3}/SrTiO{sub 3} interfaces
Journal Article · Thu Feb 06 23:00:00 EST 2014 · Journal of Applied Physics · OSTI ID:22278161
Two-dimensional superconductivity at (110) LaAlO{sub 3}/SrTiO{sub 3} interfaces
Journal Article · Sun Nov 09 23:00:00 EST 2014 · Applied Physics Letters · OSTI ID:22391961

Related Subjects

36 MATERIALS SCIENCE